I have reused them, but also put in a new set every couple of years, I just did new rotors and pads all the way around and I put new hardware in. However I used Centric parts which are like $7 a set:
I have reused them, but also put in a new set every couple of years, I just did new rotors and pads all the way around and I put new hardware in. However I used Centric parts which are like $7 a set: